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I use bundler to manage dependencies in my rails app, and I have a gem hosted in a git repository included as followed:
gem 'gem-name', :git => 'path/to/my/gem.git'
To update this gem, I execute bundle update but it also updates all the gem mentioned in Gemfile. So what is the command to update just one specific gem?
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To install it the usual way, run gem install bundler and RubyGems will install the latest version of Bundler. Now that you have Bundler 2 installed, you should know that Bundler will automatically switch between version 1 and version 2 based on your application’s Gemfile.lock.
It will probably fail if you update gems with significant dependencies ( rails ), or that a lot of gems depend on ( rack ). If a transparent update fails, your application will fail to boot, and bundler will print out an error instructing you to run bundle install .
The first step in upgrading to Bundler 2 is installing the Bundler 2 gem. To install it the usual way, run gem install bundler and RubyGems will install the latest version of Bundler.
In order to avoid this problem, when you update a gem, bundler will not update a dependency of that gem if another gem still depends on it. In this example, since rack-cache still depends on rack, bundler will not update the rack gem. This ensures that updating rails doesn't inadvertently break rack-cache.
Here you can find a good explanation on the difference between
Update both gem and dependencies:
bundle update gem-name
or
Update exclusively the gem:
bundle update --source gem-name
along with some nice examples of possible side-effects.
As @Tim's answer says, as of Bundler 1.14 the officially-supported way to this is with bundle update --conservative gem-name.
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